Hi , How are you doing ?
Let me give a positive note to begin with. If she has got pregnant once , no matter what the result was, she has very good chance of getting pregnant.
Kindly see if the following checklist of investigations is done
Husband-
Semen analysis at least 2- done 4 weeks apart preferably in an
infertility center ( examination done by andrologist), Blood sugars
Wife - Blood Sugars,
Thyroid profile
Ultrasound scans to evaluate
Uterus , Ovaries & adnexa
Confirm tubal patency- most important- Tube is the connection
between uterus & ovaries( the bridge where sperm meets the egg &
forms a baby) this is size of hair follicle & cannot be seen on scans.
So check with HSG( Xray with dye), or SSG ( Scan with dye) or
Laparoscopy
If all this done & found normal , nothing can stop a
pregnancy with God's will
Hope I have cleared your query, do write back if any more quries
All the best
Dr.Balakrishnan